PowerPoint Slideshow about 'BUILDING STRONG' - devika

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Definition. The authorized channel is defined by original, federal authorization legislation. (engineering dimensions) This textual description, when manually tied to real world coordinates, and represented by two channel toes in either an electronic or hard copy format, is known as the authorized channel.

Constructed Channel

Definition. The constructed channel may differ in dimension from the authorized channel due to funding shortfalls, or local geomorphic conditions that preclude or hinder the construction of the channel to authorized dimensions. Where constructed and authorized channel dimensions differ, both dimensions must be captured in the coastal channel framework. Where constructed channel and authorized channel are the same, a note stating such must be included with the data.

Maintained Channel

Definition. Ideally, the channel is maintained to its authorized dimensions. However, where this is not the case, a maintained channel dimension results. This maintained channel dimension should not, however, result in a new set of channel toes, centerlines, or stations. In fact, maintained channel dimensions need be reported in relation to the authorized and constructed dimensions of the channel via the channel condition report and survey.

Representation. Toes are represented by single, continuous vectors extending from the beginning to the end of each federal project or sub project. The depth of the channel toe should be provided as an attribute attached to each channel vertex.

Top of Slope Line

Definition. The slope line is derived from the channel toe line depth and angle of slope values as provided with each station line. Where a line, starting from the channel toe, intersects project datum elevation 0, that is where the top of slope line is drawn. The channel slope angle, as well as depth of channel toe, is provided as an attribute of each channel station.

Representation. TOS lines are represented by single, continuous vectors extending from the beginning to the end of each federal project or sub project. The depth of the channel toe should be provided as an attribute attached to each channel vertex.

Channel Stationing

Definition. A channel station is a reference line, primarily used during channel surveying and dredging operations, and meant to convey locations along a channel’s length. A station is placed within a channel at consistent intervals, perpendicular to the centerline, and extends horizontally to each channel toe. Traditionally, channel stations are placed every 100 feet along a channel’s length. In addition to positioning stations at regular intervals, stations also must be placed where channel toes change direction (horizontal inflection).

Representation. Channel stations are represented by individual vectors. Station names are conveyed through associated text fields. The depth of the channel toe should be provided as an attribute attached to each channel vertex.

Definition. The area within a project or sub-project traditionally used in reporting channel condition information via a channel condition report (ENG Form XX.XX). A reach may, or may not, possess a one-to-one spatial relationship to a project or sub-project. Reaches, if used for reporting purposes, must describe the entire project length.

Representation. Channel reaches are represented by individual vectors placed parallel to the channel centerline at the beginning/end of each reach.

Definition USACE continues to utilize a tabular system for reporting channel condition reports. This standardized form calls for the structuring of such reporting into either three, or four channel sections depending on the width of the channel in question.